President Bush has nominated Zalmay Khalilzad to replace Michael Bolton as the U.S. ambassador to the United Nations.
Afgan born Khalilzad has served as the U.S ambasssador to Iraq, and formerly Afganistan, he will be replaced in Iraq by veteran diplomat Ryan Crocker.
Other administration changes include naming Gen. John Abizaid, to the top U.S. commander position. He will oversee the military theater that includes Iraq.
Abizaid will be succeeded by Adm. William Fallon, now Abizaid's counterpart in the Pacific. Army Lt. Gen. David Petraeus is the president's choice to be the new chief commander in Iraq, replacing Gen. George Casey.
Casey in turn will replace the retiring Gen. Peter Schoomaker as Army chief of staff.
Bush has also decided to shift John Negroponte, the national intelligence director, to the State Department to become No. 2 to Rice. Replacing Negroponte will be retired Vice Adm. Mike McConnell, a veteran of more than 25 years in intelligence.